AGRICULTURAL 

 BACTERIOLOGY 



THEORETICAL AND PRACTICAL 



BY 



JOHN PERCIVAL, M.A., F.L.S. 



PROFESSOR OF AGRICULTURAL BOTANY. UNIVERSITY COLLEGE, READING 



SECOND EDITION 



LONDON 



DUCKWORTH & CO. 



3 HENRIETTA STREET, COVENT GARDEN, W.C. 

 1920 



